Electric motor



1931- c. P. EISENHAUER 1,835,029

ELECTRIC MOTOR Filed March 11, 1929 2 Sheets-Sheet l (mamas P.E/sE/vH/wm,

wovnw Patented Dec. 8, 1931 UNITED STATES PATENT OFFICE TO THE DUROCOMPANY, OF

OHIO

ELECTRIC MOTOR Application filed March 11, 1929. Serial No. 346,100.

My invention relates to propulsion-induction motors, and, in particular,to a cutout mechanism therefor.

It is the object of my invention to provide a oentrifugally-operatedcutout which is spring resisted in its outward movement.

In particular, it is a feature of my invention to provide a slidingspring-resisted sleeve that not only resists the movement of the contactmembers but serves to hold them uniformly in engagement with thecommutator.

Referring to the drawings:

Figure 1 is a side elevation partially in section showing the parts inposition of rest;

Figure 2 is a similar view showing the parts in operation;

Figure 3 is a section on the line 33 of Figure 2;

Figure 4 is an end elevation;

Figure 5 is a perspective of one of the contact segments.

Referring to the drawings in detail, 1 is an armature shaft having acommutator 2 mounted thereon. This commutator is provided with aninternally-arranged cut away portion or slot 3 with a contact face 4with which the contact segments 5 engage.

Each of these segments is provided with a head 6, a stem 7 and a footportion 8 having a heel 9 on which the segment pivots. The toe of thisfoot portion designated 10 engages with the rear wall of an annular,

r cup-shaped member 11, one wall of which 12 acts as an internal supportfor the segment maintaining them in alignment while the other wall 13serves as a base upon which the ring 11 slides on the retaining cup 14in which the segments pivot. This sliding ring 11 is resisted in itssliding movement by the spring 15, the free end of which rests upon thecollar 16.

The retaining cup has a sleeve 17 mounted on the armature shaft 1 thatforms the annular sliding support for the cup-shaped member 11. Onecorner of the bottom of the cup, as at 18, serves as a pivotal point forthe rocking of the segments 5.

When the armature shaft gets up its speed, the segments pivot about thecenter 19 on the cup 14 until the outer ends 6 engage the surface 4 ofthe commutator 3. This centrifugal action occurs against the resistancebetween the toe 10 and the annular member 11 and the spring 15. Theadvantage of my construction is that I have a single spring of ruggedcharacter thoroughly enclosed where dirt cannot prevent its operation.

I have frictional resistance between the annular member 11 and thesleeve 17 in addition to the spring resistance. I provide a support suchas the member 11 and its wall 12 that maintains the segments all inpredetermined relationship.

This prevents any segments from making contact or breaking contactprematurely ahead of the other segments. It causes the segments to moveas a unit. Iteliminates the spring which has customarily been placedaround such segments. Such a spring, because weaker in one place andstronger in the other would eventually allow some segments to makecontact or break contact before the others. It is highly essential insuch a construction to provide for a uniform, positive and evenoperation.

It will be understood that I desire to comprehend within my inventionsuch modifications as may be necessary to adapt it to varying conditionsand uses.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is:

1. In combination, a commutator, a segment supporting cup formed fromone piece of sheet metal, a plurality of segments pivoted therein, asegment aligning annular cup slidably mounted within the space inclosedby said segments to maintain them in alignment, and yielding meansresting within said annular cup to resist the reciprocation of saidannular cup when moved by the segments during the centrifugal operationthereof.

2. In combination, a commutator, a supporting cup for contact segments,of contact segments comprising head stem and foot, said segments beingadapted to be pivoted on the cup on the heel of the segments, said footresting on the bottom of the cup, and yielding means to resist a contacta plurality 9 the pivotal movement of said segments, a

' sliding spacing member held between the toe of said foot and saidyielding means and between the inside of the stem of said segments andan armature shaft supporting said commutator, said cup substantiallyenclosing said segments, said spacing member and yielding means. 7

3. In combination, a commutator having an internally disposed contactsurface, an armature shaft supporting the commutator, a plurality ofcontact segments having a contact head, stem and foot, a horizontallydis- 7 posed supporting cup mounted on said armature shaft, the bottomof the foot of said segments resting on the bottom of the cup, anannular member U-shaped in section, the bottom of which engages thetopof said foot and one side of which engages the inner sides ofthesegment stems and the other side of which is slidably mounted on theinside of the cup adjacent the armature shaft, and yielding means forresisting the movement of said member through the action of the, toe ofthe foot when the contact head is moved outwardly centrifugally.

4. In combination, an armature shaft, an internal cutaway commutatorthereon, aplurality of segments having heads adapted to engage saidcommutator, a supporting cup mounted on said armaturejshaft in whichsaid segments are pivotally' mounted, segments aligning means slidablymounted on the armature shaft supporting the inner sides of saidsegments and adapated to be moved by saidsegments when they arecentrifugally operated and yielding means for resisting said movement,said supporting cup substantially enclosing said Segments and aligningmeans. 7

5'. In combination, an armature shaft, a commutator thereon havmg acutaway portion, a supporting and enclosing cup forming with saidcutaway portion a chamber, sald cup having an lnwardly directed sleevemember engaging said shaft, a plurality of contact segments in saidchamber, each contact segment having a head projecting wIt', hm saidcutaway portion adapted to engage said commutator, a stem and afoot-like part engaging said cup for pivotal movement 'aboutithe heel051: said foot-like part, a U- shaped ring having one side engaging thestems of said segments, another side. engaging said sleeve andanotherside engaging the toes of sald foot-like parts, and a spring be- 7 tweensaid ring and said commutator to control the movement of'the segmentsdue to the rotation of said shaft. 7

In testimony whereof, I affix my signature.

CHAS. P. EISENHAUER.

